Improved auxiliary jaw for planer-chuck



C. H. RIGGS.

law for Planer Chuck. No. 90,783. Patented June 1, 1869.

W Inwnfirtinned fitting 13 start can.

Letters Patent No. 90,783, dated June 1, 1869.

IMPROVED AUXILIARY JAW FOR Pi ANER-CHUCK The Schedule referred to in these Letters Patent and making part of the same.

To all whom it may concern Be it known that I, CHARLES H. RIGGS, of Windsor Locks, Hartford county, State of Connecticut, have invented certain new and useful Improvements in the Construction of Adjustable Jaws for Planer-Chucks; and I do hereby declare that the following is a full and clear description thereof, reference being had to the accompanying drawings, and to the letters of reference marked thereon.

In the drawings Figure l is a top view of my improved jaws, as arranged upon a planer-chuck bed, and

Figure 2 is a cross-sectional view of one of them;

Figure 3 being an outside view, in a similar position as fig. 1.

The object of my improvements is to obtain an independent attachment, which can be applied to almost any chuck .having two parallel jaws, and which willhold work to be planed, turned, or drilled, at an angle. Its capacity is from one to forty-five degrees, and these'results can be obtained without altering the position of the chuck after it has once been set in its place, my independent auxiliary jaws having been attached in a proper manner.

In construction, my auxiliary jaws are formed o'f plates A and B, which are attached to the jaws of the chuck, the one, A,--..heing attached to the stationary jaw by means of bolts, 2) and I), put through the latter, and the one, B, being attached to the movable jaw by means of projections or pins, 0 and c, which,

entering corresponding sockets in the movable jaw of K the chuck, hold the plate B in place, when the jaw is clamped in position by the ordinary means.

The plates A and B are each provided with a semicircular curved face, 0, into which fits and works a semi-cylindrical auxiliary jaw, D, confined in place by means of projections E, at its ends, these projections forming parts of, or being attached to the plates A or B, and extending past the ends of the pieces D, which have a curved groove, F, in each, into which fit correspondingly-curved projections, G, from the ones E, and so holdthe cylindrical parts of the pieces D against the curved faces C of the plates A aud'B.

These jaws D are operated by means of a worm, H,

k, put throughjt from the top of the arranged in the central part of the plates A andB respectively, the worm H meshing with 'a corresponding rack, g, out into the cylindrical part of the jaw D.

The worm itself is turned by means of a centre-pin, plates A or B, this pin passingthrough it, and having its bearings in the stock of the plate above and below. It only extends far enough below the worm, however, to obtain a sufliciently strong bearing, weakening the stock at this point as little as possible by its arrangement. A

centre hole, t, is left, however, through the plate, so that the pin may be pushed out, if necessary.

In order'to connect the pin K with the worm H, so that the latter will turn with it,I slot the pin from the lower end, a small pin in the bore of the worm fitting in this slot, and preventing the pin K from turning in the worm.

The top edge of the plates A and B are bevelled off at f; so that the extreme angle of the jaws may be used.

A scale of degrees is out upon one end of the jaws, upon the cylindrical part, and this indicates the angle to which the stock is set relatively to the face of the jawechuck.

The advantages of this arrangement of auxiliary jaws are, that obtuse angles are obtained without'taking the chuck off the machine, or bolting the work to its bed, for as forty-five degrees can usually be obtained from the cross-head of the planer, the other forty-five, completing the right .angle, can be obtained from the use of my auxiliary jaws.

. Having described my invention,

\Vhat I claimas new, and desire to secure by Letters Patent, is

The construction and arrangement of the plates A and B, with semi-cylindrical jaws D, held in place between projections E by tongues and grooves, and operated by means of the worms H, the parts being all "combined together, substantially as and for the purpose described.

' CHAS. H. RIGGS Witnesses:

EDWARD HI HYDE, J. B. GARDINER. 

